AZTECA, I can't make a direct comparison because we only visited the North Rim. I suspect there's a lot more organized programs at the South Rim just because that's where the bulk of the visitors are. In particular, North Rim has a very, very small visitor/interpretive center if that's your thing (really just a gift shop). That said, North Rim has its own Junior Ranger program (different book than South Rim) and what I thought was a reasonable daily set of ranger-led walks, campfire talks, etc. We did a few and they were enjoyable and certainly comparable to what my junior ranger has done in other parks, including Bryce on that same trip. Since most are basically exercises in educational public speaking a lot of it, like anywhere, depends on your ranger. If you look at the NPS site (http://www.nps.gov/grca/planyourvisit/things2know.htm) you'll see the Summer 2014 newsletter is still posted with the park program schedule. I'd expect 2015 to be similar. Like others in this thread we chose the North Rim based on the lack of crowding, and I can confirm that even in midsummer we never felt the park was packed. The area around the North Rim lodge was, perhaps, right at the limit of what I find tolerable in terms of crowds, but that fell off rapidly as soon as you got away from the lodge and onto the trails. If you do go to North Rim make sure to check at the visitor center for the weekly stargazing talks. While the North Rim was smaller than Bryce's program (just one telescope vs 20 or more at Bryce), it is quite a view and was a hit with my sleepy junior ranger.